# GLMakie: how to plot two images with transparency?

**URL:** <https://discourse.julialang.org/t/glmakie-how-to-plot-two-images-with-transparency/66492>\
**Category:** Visualization\
**Tags:** question, plotting\
**Created:** [August 16, 2021, 3:03pm UTC](https://discourse.julialang.org/t/glmakie-how-to-plot-two-images-with-transparency/66492 "2021-08-16T15:03:00Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mariusd](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mariusd/32/23231_2.png) [@mariusd](https://discourse.julialang.org/u/mariusd)\
**Post date:** [August 16, 2021, 3:03pm UTC](https://discourse.julialang.org/t/glmakie-how-to-plot-two-images-with-transparency/66492/1 "2021-08-16T15:03:00Z")

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I’m using GLMakie to display 2 images.  
GLMakie.image(GLMakie.rotr90(image\_data))  
GLMakie.image!(GLMakie.rotr90(some\_extra\_data), colormap=“viridis”)

This code will display “some\_extra\_data” and the “image\_data” is no longer visible.  
How can I set a transparency value for “some\_extra\_data”?

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**Author:** ![lazarusA](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/lazarusa/32/6571_2.png) [@lazarusA](https://discourse.julialang.org/u/lazarusA)\
**Post date:** [August 16, 2021, 4:58pm UTC](https://discourse.julialang.org/t/glmakie-how-to-plot-two-images-with-transparency/66492/2 "2021-08-16T16:58:39Z")

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Just do `colormap=(“viridis”,0.5)`, that will give you a transparent colormap.

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**Author:** ![mariusd](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mariusd/32/23231_2.png) [@mariusd](https://discourse.julialang.org/u/mariusd)\
**Post date:** [August 16, 2021, 7:15pm UTC](https://discourse.julialang.org/t/glmakie-how-to-plot-two-images-with-transparency/66492/3 "2021-08-16T19:15:53Z")

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It works thanks 🙂 . I have the feeling that the Makie documentation shall be improved. The solution is so simple and I was unable to find it via documentation.

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**Author:** ![jules](https://avatars.discourse-cdn.com/v4/letter/j/41988e/32.png) [@jules](https://discourse.julialang.org/u/jules)\
**Post date:** [August 16, 2021, 8:47pm UTC](https://discourse.julialang.org/t/glmakie-how-to-plot-two-images-with-transparency/66492/4 "2021-08-16T20:47:15Z")

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You can always make a docs PR if something is missing